My mom always had irregular periods and had three kids, it just took a while for her to get pregnant each time.

You could try taking Vitex (chaste berry), which helps regulate hormones and may help your periods to be more regular. I know it has helped at least one person on this board who has PCOS.

I would also definitely recommend going to your doctor and being checked for PCOS. If you do have it, you can work on treating it right away, without going through trying to conceive for a long time and then wondering what is wrong. And a doctor can prescribe Clomid to help you ovulate, even if you don't have PCOS.